Proceedings of the American Academy of Arts and Sciences. 



Vol. 52. No. 5.— October, 1916. 



CONTRIBUTIONS FROM THE ZOOLOGICAL LABORATORY 



OF THE MUSEUM OF COMPARATIVE ZOOLOGY 



AT HARVARD COLLEGE.- No. 280. 



THE 'REFRACTIVE BODY' AND THE 'MITOCHONDRIA' 

 OF ASCARIS CAN IS WERNER. 



By a. C. Walton. 



With Two Plates. 



